Pop star Demi Lovato has been hospitalised in California to treat a lung infection, according to a U.S. report.

The Heart Attack hitmaker was rushed to the emergency room at the Providence Tarzana Medical Center in California on Tuesday (24Feb15) after she began suffering breathing problems.

Following a series of tests, medics determined the health crisis is flu-related and gave her medication.

According to Tmz.com, Lovato was still in hospital by Tuesday afternoon, but it was not known if she had been discharged as Wenn went to press. A representative for Lovato had yet to respond to Wenn's request for comment.